any ideas about GSM/FYP?? URGENT

Hi all ,, my name is maysaa , 4th year , comm. eng. , my FYP is about GSM and i need an idea about a good project about GSM which is not complicated ,, & im gonna use MATLAB ( simulink ) and the ADS softwares for simulation ,,, so any one can help me ??
please send me any thing about the GSM that may help me ,, i do really need u'r help as soon as possible ,, & i want web sites that may be useful too ,,, please send to me anything to may mail :
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thanks alot dears